- merge -lock into -common

[packages/nfs-utils.git] / nfs-utils-heimdal-kcm.patch

diff --git a/utils/gssd/gssd.c b/utils/gssd/gssd.c
index ccadb07..c1339b6 100644
--- a/utils/gssd/gssd.c
+++ b/utils/gssd/gssd.c
@@ -60,6 +60,7 @@ char keytabfile[PATH_MAX] = GSSD_DEFAULT_KEYTAB_FILE;
 char ccachedir[PATH_MAX] = GSSD_DEFAULT_CRED_DIR;
 char *ccachesearch[GSSD_MAX_CCACHE_SEARCH + 1];
 int  use_memcache = 0;
+int  use_kcmcache = 0;
 int  root_uses_machine_creds = 1;
 unsigned int  context_timeout = 0;
 char *preferred_realm = NULL;
@@ -85,7 +86,7 @@ sig_hup(int signal)
 static void
 usage(char *progname)
 {
-	fprintf(stderr, "usage: %s [-f] [-M] [-n] [-v] [-r] [-p pipefsdir] [-k keytab] [-d ccachedir] [-t timeout] [-R preferred realm]\n",
+	fprintf(stderr, "usage: %s [-f] [-K] [-M] [-n] [-v] [-r] [-p pipefsdir] [-k keytab] [-d ccachedir] [-t timeout] [-R preferred realm]\n",
 		progname);
 	exit(1);
 }
@@ -102,7 +103,7 @@ main(int argc, char *argv[])
 	char *progname;
 
 	memset(ccachesearch, 0, sizeof(ccachesearch));
-	while ((opt = getopt(argc, argv, "fvrmnMp:k:d:t:R:")) != -1) {
+	while ((opt = getopt(argc, argv, "fvrmnMKp:k:d:t:R:")) != -1) {
 		switch (opt) {
 			case 'f':
 				fg = 1;
@@ -113,6 +114,9 @@ main(int argc, char *argv[])
 			case 'M':
 				use_memcache = 1;
 				break;
+			case 'K':
+				use_kcmcache = 1;
+				break;
 			case 'n':
 				root_uses_machine_creds = 0;
 				break;
diff --git a/utils/gssd/gssd.h b/utils/gssd/gssd.h
index b1b5793..82c4406 100644
--- a/utils/gssd/gssd.h
+++ b/utils/gssd/gssd.h
@@ -63,6 +63,7 @@ extern char			pipefs_dir[PATH_MAX];
 extern char			keytabfile[PATH_MAX];
 extern char			*ccachesearch[];
 extern int			use_memcache;
+extern int			use_kcmcache;
 extern int			root_uses_machine_creds;
 extern unsigned int 		context_timeout;
 extern char			*preferred_realm;
diff --git a/utils/gssd/krb5_util.c b/utils/gssd/krb5_util.c
index f071600..503cac2 100644
--- a/utils/gssd/krb5_util.c
+++ b/utils/gssd/krb5_util.c
@@ -125,6 +125,7 @@
 #include "err_util.h"
 #include "gss_util.h"
 #include "krb5_util.h"
+#include "xcommon.h"
 
 /* Global list of principals/cache file names for machine credentials */
 struct gssd_k5_kt_princ *gssd_k5_kt_princ_list = NULL;
@@ -299,6 +300,115 @@ gssd_find_existing_krb5_ccache(uid_t uid, char *dirname, struct dirent **d)
 	return err;
 }
 
+#ifdef HAVE_HEIMDAL
+static int
+gssd_find_existing_krb5_ccache_kcm(uid_t uid, char **cc)
+{
+	krb5_context context;
+	krb5_cc_cache_cursor cursor;
+	krb5_ccache id;
+	char *best_match_name = NULL;
+	krb5_timestamp best_match_mtime, mtime;
+	char *ccname;
+	uid_t ccuid;
+	int i;
+	int found = 0;
+	char buf[1030];
+	char *princname = NULL;
+	char *realm = NULL;
+	int score, best_match_score = 0, err = -EACCES;
+
+	*cc = NULL;
+	if (krb5_init_context(&context))
+		return err;
+
+	if (krb5_cc_cache_get_first(context, "KCM", &cursor))
+		return err;
+
+	while (krb5_cc_cache_next(context, cursor, &id) == 0) {
+		ccname = xstrdup(krb5_cc_get_name(context, id));
+		if (ccname == NULL) {
+			printerr(0, "Error getting CC name\n");
+			continue;
+		}
+		for (i=0,ccuid=0; ccname[i] && isdigit(ccname[i]); i++) {
+			ccuid = ccuid*10 + (ccname[i] - '0');
+		}
+		if (i == 0) {
+			printerr(3, "CC '%s' not available due to"
+					" non-standard name\n",
+				 ccname);
+			continue;
+		}
+		/* Only pick caches owned by the user (uid) */
+		if (ccuid != uid) {
+			printerr(3, "CC '%s' owned by %u, not %u\n",
+				 ccname, ccuid, uid);
+			continue;
+		}
+		snprintf(buf, sizeof(buf), "KCM:%s", ccname);
+		if (!query_krb5_ccache(buf, &princname, &realm)) {
+			printerr(3, "CC '%s' is expired or corrupt\n",
+				 ccname);
+			err = -EKEYEXPIRED;
+			continue;
+		}
+		krb5_cc_last_change_time(context, id, &mtime);
+
+		score = 0;
+		if (preferred_realm && strcmp(realm, preferred_realm) == 0) 
+			score++;
+
+		printerr(3, "CC '%s'(%s@%s) passed all checks and"
+			    " has mtime of %u\n",
+			 ccname, princname, realm, mtime);
+		/*
+		 * if more than one match is found, return the most
+		 * recent (the one with the latest mtime), and
+		 * don't free the dirent
+		 */
+		if (!found) {
+			best_match_name = ccname;
+			best_match_mtime = mtime;
+			best_match_score = score;
+			found++;
+		} else {
+			/*
+			 * If current score is higher than best match 
+			 * score, we use the current match. Otherwise,
+			 * if the current match has an mtime later
+			 * than the one we are looking at, then use
+			 * the current match.  Otherwise, we still
+			 * have the best match.
+			 */
+			if (best_match_score < score ||
+			    (best_match_score == score && 
+			       mtime > best_match_mtime)) {
+				free(best_match_name);
+				best_match_name = ccname;
+				best_match_mtime = mtime;
+				best_match_score = score;
+			} else {
+				free(ccname);
+			}
+			printerr(3, "CC '%s' is our current best match "
+				    "with mtime of %u\n",
+				 best_match_name, best_match_mtime);
+		}
+		free(princname);
+		free(realm);
+	}
+	krb5_cc_cache_end_seq_get(context, cursor);
+	krb5_free_context(context);
+	if (found) {
+		*cc = best_match_name;
+		return 0;
+	}
+
+	return err;
+}
+#endif
+
 /*
  * Obtain credentials via a key in the keytab given
  * a keytab handle and a gssd_k5_kt_princ structure.
@@ -1002,12 +1112,26 @@ gssd_setup_krb5_user_gss_ccache(uid_t uid, char *servername, char *dirname)
 	printerr(2, "getting credentials for client with uid %u for "
 		    "server %s\n", uid, servername);
 	memset(buf, 0, sizeof(buf));
-	err = gssd_find_existing_krb5_ccache(uid, dirname, &d);
-	if (err)
-		return err;
+#ifdef HAVE_HEIMDAL
+	if (use_kcmcache) {
+		char *s;
+		err = gssd_find_existing_krb5_ccache_kcm(uid, &s);
+		if (err)
+			return err;
+
+		snprintf(buf, sizeof(buf), "KCM:%s", s);
+		free(s);
+	} else {
+#endif
+		err = gssd_find_existing_krb5_ccache(uid, dirname, &d);
+		if (err)
+			return err;
 
-	snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
-	free(d);
+		snprintf(buf, sizeof(buf), "FILE:%s/%s", dirname, d->d_name);
+		free(d);
+#ifdef HAVE_HEIMDAL
+	}
+#endif
 
 	printerr(2, "using %s as credentials cache for client with "
 		    "uid %u for server %s\n", buf, uid, servername);